Ocado joins 'price promise' price war: what's the catch?

Katie Collins/PA

The complex and confusing world of the supermarket price promise has welcomed a newcomer. This one is rather surprising, because upmarket Ocado has joined the throng.

It promises to price match Tesco, and if a comparison shows you would have spent less at Tesco, you'll have the difference refunded - plus 1p. So does this mean Ocado will always be cheaper?
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